// remove the first occurrence of the object to Remove, if multiple copies exit. //The method below is defined in the class of LinkedList with a dummy head node. public boolean removel Object toRemove) { for(Node prev = this.head, cur = this.head.next; cur != null; prev = cur, cur = cur.next) { if(cur.data.equals(toRemove)) { //cur.data.equals(toRemove) prev.next = cur.next; this.size - return true; } }//end for return false; }//end method Assume we have a String S = "abc"; Then trace the method call remove( S) on an empty linked list which is shown below. Which statement is true? Input Linked List with a dummy head node IX x 18 ( (empty List) head The method causes a null pointer exception, at the line cur = cur.next; The method causes a null pointer exception, at the line cur = this.head.next; The method returns false without causing any exception. The method causes a null pointer exception, at the line Node prev = this.head; The method causes a null pointer exception, at the line cur.data.equals(toRemove)